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DESCRIPTION JP2008263482

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DESCRIPTION JP2008263482
When a speaker device provided at the rear of a vehicle is used in a vehicle when the back door
is closed, it is possible to enhance the bass reproduction capability of the speaker device so that
the speaker device can be used effectively. A vehicle-mounted acoustic device provided in a
vehicle having a pivotable back door on a vehicle body, comprising: a first enclosure provided on
the vehicle body, and the first enclosure facing the rear of the vehicle A first port and a first
speaker unit, a second enclosure provided on the back door, and a second port and second
provided on the second enclosure to face the front of the vehicle when the back door is closed
And a closing member provided on the back door. The first speaker unit is disposed substantially
symmetrically with the second speaker unit with respect to a plane that bisects the angle of
rotation based on the time of closing of the back door, and the first port rotates the angle of
rotation The occluding material is disposed substantially symmetrically with respect to the
bisecting plane. [Selected figure] Figure 1
Automotive audio equipment
[0001]
The present invention relates to an on-vehicle acoustic device provided in a vehicle having a back
door.
[0002]
As a conventional in-vehicle acoustic device, there is a device in which a speaker device is
provided on the inner surface of the back door, and the speaker device faces outside the vehicle
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when the back door is opened and used outside the vehicle.
Further, in the conventional in-vehicle acoustic device, when the back door is closed, the speaker
device faces in the vehicle and is used in the vehicle (see, for example, Patent Document 1).
Japanese Utility Model Application Publication No. 61-64053
[0003]
However, in the conventional vehicle-mounted acoustic device, when the speaker device is used
in the vehicle when the back door is closed, the medium to high sound is attenuated by the
luggage placed on the tonneau cover or the luggage compartment and it becomes difficult to
transmit to the user. Was not able to be used effectively.
[0004]
On the other hand, if bass reproduction is possible, the sound will be easily transmitted to the
user, but the conventional on-vehicle acoustic device does not change the capacity and type of
the speaker device when the back door is opened and closed. Could not get.
[0005]
The present invention has been made to solve the conventional problems, and when a speaker
device used outside the vehicle when the back door is opened is used in the vehicle when the
back door is closed, the bass reproduction capability is enhanced, and luggage is loaded in the
luggage compartment It is an object of the present invention to provide an on-vehicle acoustic
device in which the speaker device can be effectively used even when the speaker is mounted or
the tono cover is attached.
[0006]
An on-vehicle acoustic apparatus according to the present invention is an acoustic apparatus
provided in a vehicle having a pivotable back door on a vehicle body, the first enclosure provided
on the vehicle body, and the first enclosure facing the back of the vehicle. A first port and a first
speaker unit provided in the second enclosure, a second enclosure provided in the backdoor, and
the second enclosure facing the front of the vehicle when the backdoor is closed. The second
door and the second speaker unit provided, and the closing member provided on the back door,
wherein the first speaker unit is rotated based on the time when the back door is closed. Are
arranged approximately symmetrically with the second speaker unit with respect to a plane
which bisects the angle of the second door, and the first port is closed with respect to a plane
which bisects the angle of rotation of the back door. It is intended to place substantially
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symmetrically and wood.
[0007]
When the back door is closed, the first and second speaker units come close to each other to
form one speaker unit.
The interior of the first enclosure becomes an enclosed space by the first port being closed by
the closing member.
At this time, the volume of the enclosure is the sum of the volume of the first enclosure and the
volume of the second enclosure.
Since the volume of the speaker device is larger than when the back door is opened, the lowest
resonance frequency is lowered.
As described above, the vehicle-mounted acoustic device of the present invention can reproduce
bass when the back door is closed. The bass is easily diffracted compared to the middle and high
tones, so it is easy to be transmitted even if there is an obstacle, and the bass is easier to be
transmitted via the vehicle than the middle and high tones.
[0008]
The present invention can enhance the low-pitched sound reproduction capability of the speaker
device when the back door is closed, and the sound output from the speaker device can be easily
transmitted to the user even when the luggage is placed in the luggage compartment or the tono
cover is attached. Therefore, the speaker device can be used effectively.
[0009]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
[0010]
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First Embodiment FIG. 1 is a view of a vehicle-mounted acoustic device according to the present
embodiment as viewed from the rear of a vehicle 1a.
[0011]
The vehicle-mounted acoustic device in the present embodiment includes an enclosure 10, a
speaker unit 11, a sealing material 12, a port 13, an enclosure 20, a speaker unit 21, a sealing
material 22, and a port 23.
[0012]
The speaker unit 11 includes a cone-shaped diaphragm, an edge joined to the periphery thereof,
and a frame for supporting an outer peripheral portion of the edge, and converts a voltage signal
into sound and outputs the sound.
The same structure and operation are also applied to the speaker unit 12.
The enclosure 10 is provided with the speaker unit 11 and the port 13 to constitute one speaker
device.
The same applies to the enclosure 20, the speaker unit 21 and the port 23.
[0013]
In addition, the vehicle 1 a includes a vehicle body 2 and a back door 3.
The vehicle body 2 is a portion of the vehicle 1 a other than the back door 3, and an opening is
provided at the rear end of the vehicle body 2. Further, the vehicle body 2 is provided with a
luggage space at the rear of the rear seat 8. The loading space is provided with a loading space
bottom 6 installed substantially horizontally. The loading space may be a portion corresponding
to the loading space behind the rear seat 8, and the vehicle 1a does not necessarily have to have
the loading space. In addition, a back door 3 pivoting in a substantially horizontal direction about
the hinge 5 is attached to the edge of the opening. The angle of rotation of the back door 3 is, for
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example, at most about 180 degrees on the basis of the time when the back door 3 is closed.
[0014]
The X axis shown in FIG. 1 is an axis whose forward direction is the direction in which the vehicle
1a advances. The Y-axis is an axis which is perpendicular to the X-axis and whose right direction
is the positive direction with respect to the positive direction of the X-axis. The Z-axis is an axis
which is perpendicular to the X-axis and whose positive direction is the upper direction with
respect to the positive direction of the X-axis.
[0015]
Further, the surface of the back door 3 that faces in the positive direction of the X axis when the
back door 3 is closed is referred to as ?the inner surface of the back door 3?. Further, in FIG. 1,
a surface including the opening of the vehicle body 2 is referred to as an ?opening surface?.
[0016]
The enclosure 10 is disposed, for example, at the left end of the cargo space bottom 6 and near
the opening surface. In addition, the speaker unit 11 and the port 13 are provided on the outer
surface 15 of the enclosure 10 facing in the negative direction of the X axis. The enclosure 10
may be installed on the cargo space bottom 6 or embedded in the cargo space bottom 6.
However, the condition is that the speaker unit 11 and the port 13 are not buried in the bottom
of the loading space 6. The speaker unit 11 is disposed, for example, in the negative direction of
the Y axis from the port 13.
[0017]
In addition, an enclosure 20 is provided at the end of the inner surface of the back door 3
opposite to the hinge 5. In addition, the speaker unit 21 and the port 23 are provided on the
outer surface 25 of the enclosure 20 that faces in the positive direction of the X axis when the
back door 3 is closed. The speaker unit 21 is disposed, for example, in the negative direction of
the Z axis from the port 23.
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[0018]
In addition, the sealing material 12 is provided on the outer periphery of the speaker unit 11,
and the sealing material 22 is provided on the outer periphery of the speaker unit 21. The
sealing materials 12 and 22 preferably have the same shape and the same material. The sealing
material 12 and the sealing material 22 contact each other when the back door 3 is closed, and
tightly seal the front surface of the speaker unit 11 and the front surface of the speaker unit 22
without any gap.
[0019]
When the back door 3 is opened, the speaker unit 11 and the port 13 face in the negative
direction of the X axis, and the speaker unit 21 and the port 23 also face in the negative direction
of the X axis.
[0020]
In addition, a closure 29 for closing the port 13 is disposed, for example, on the inner surface of
the back door 3 and closer to the hinge 5 than the enclosure 20.
The closing member 29 is disposed on substantially the same plane as the sealing member 22.
The material of the blocking member 29 is not limited as long as the port 13 can be closed.
[0021]
Next, the relationship of the arrangement of each part will be described in more detail with
reference to FIGS. 2 and 3 are views of the in-vehicle acoustic device according to the present
embodiment as viewed from above the vehicle 1a, and FIG. 4 is a rear view of the vehicle 1a
when the backdoor 3 is closed in the in-vehicle acoustic device according to the present
embodiment. It is the figure seen from.
[0022]
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As shown in FIG. 2, the speaker unit 11 is disposed substantially symmetrically with the speaker
unit 21 with respect to a surface 81 which is a surface which divides the angle of rotation of the
back door 3 into two equal parts. In addition, the port 13 and the blocking member 29 are also
arranged substantially symmetrically with respect to the surface 81.
[0023]
In addition to the configuration described in FIG. 1, the in-vehicle acoustic device in the present
embodiment includes an output device 7 a. The output device 7a is a device that individually
outputs an acoustic signal to the speaker units 11 and 21. The acoustic signal is a signal
representing a sound such as voice or music. The speaker units 11 and 21 output sound
according to the acoustic signal.
[0024]
Next, the case where the arrangement of the speaker units 11 and 21 is changed will be
described using FIGS. 3 (a) and 3 (b). FIGS. 3A and 3B are enlarged views of a portion surrounded
by a dashed dotted line 83 in FIG. The axis A shown in FIGS. 3A and 3B is an axis substantially
perpendicular to the opening surface 82, and the intersection of the opening surface 82 and the
axis A is the origin, and the direction in which the vehicle 1a moves backward is the positive
direction. It is an axis. The axis B is an axis substantially perpendicular to the back door 3 and is
an axis having an intersection point of the back door 3 and the axis B as an origin and a direction
in which the inner surface of the back door 3 faces is a positive direction.
[0025]
In FIGS. 3A and 3B, the coordinates of the intersection of the plane including the outer surface
15 of the enclosure 10 and the axis A, which is the coordinates of the axis A, is d1. Further, it is
assumed that the coordinate of the intersection point of the plane including the outer surface 25
of the enclosure 20 and the axis B, which is the coordinate of the axis B, be d2. Further, the
thickness of the enclosure 10 in the axis A direction is K1, and the thickness of the enclosure 20
in the axis B direction is K2. Further, the thickness of the back door 3 is L.
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[0026]
As shown in FIG. 3A, the speaker unit 11 may be moved in the positive direction of the axis A
compared to FIG. 2, and the speaker unit 21 may be moved in the negative direction of the axis B
compared to FIG. Also in this arrangement, when the back door 3 is closed, the speaker units 11
and 21 face each other and approach each other. However, the following conditions need to be
met.
[0027]
d1 is opposite in sign to d2 and equal in absolute value. If this condition is not satisfied, the
speaker unit 11 does not approach the speaker unit 21 when the back door 3 is closed, or the
speaker unit 11 contacts the speaker unit 21 before the back door 3 is closed. .
[0028]
d1 can not be larger than K1 in the positive direction of the axis A. This is because the enclosure
10 can not be installed in the vehicle body 2. Also, d2 can not be larger than L in the negative
direction of the axis B. This is because the enclosure 20 can not be installed in the back door 3.
From the above, d1 and d2 fall within the ranges shown by the following equations. d1 = ?d2 иии
Formula 1 d1 <K1 иии Formula 2?L <d2 иии Formula 3 Also, as shown in FIG. 3B, the speaker unit
11 is in the negative direction of the axis A as compared with FIG. The speaker unit 21 may be
moved in the positive direction of the axis B as compared with FIG. Also in this arrangement,
when the back door 3 is closed, the speaker units 11 and 21 face each other and approach each
other. However, the following conditions need to be met.
[0029]
d1 is opposite in sign to d2 and equal in absolute value. The reason is the same as the reason
shown in the description of FIG. d1 can be set in a range in which it can be installed in the
luggage compartment of the vehicle 1a in the negative direction of the axis A. Also, d2 can not be
larger than K2 in the positive direction of the axis B. This is because the enclosure 20 can not be
installed in the back door 3. Thus, d2 is in the range indicated by the following equation. d2 <K2
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.. Formula 4 If Formula 1-Formula 4 is put together, the range of d1 can be represented by
Formula 5 and d2 can be represented by Formula 6. FIG. ?K 2 <d 1 <(one smaller than K 1 and
L) Expression 5 d 2 = ?d 1 иии Expression 6 In ?arranged substantially symmetrically with
respect to the surface 81? in the present embodiment, Expression 5 and Expression 6 Shall
contain an arrangement that satisfies
[0030]
As described above, the speaker unit 11 is disposed substantially symmetrically with the speaker
unit 21 with respect to the surface 81 and in the vicinity of the opening surface. Therefore, the
speaker unit 11 faces the speaker unit 21 when the back door 3 is closed. In addition, the sealing
material 12 faces and contacts the sealing material 22. As a result, the front of the speaker unit
11 is sealed by the front of the speaker unit 21. When the back door 3 is closed, the speaker
units 11 and 21 become one speaker unit.
[0031]
In addition, the port 13 is substantially symmetrical to the closing member 29 with respect to the
surface 81 and is disposed in the vicinity of the opening surface. Therefore, when the back door
3 is closed, the port 13 contacts the closing member 29. As a result, the port 13 is closed by the
closing member 29 and the inside of the enclosure 10 becomes an enclosed space.
[0032]
Further, as shown in FIG. 4, when the back door 3 is closed, the port 23 faces in the vehicle
interior direction which is the positive direction of the X axis. As described above, when the back
door 3 is closed, the speaker units 11 and 21 become one speaker unit, and the port 23 faces the
inside of the vehicle 1a.
[0033]
Next, the structure of the speaker device when the back door 3 is opened and closed will be
described using FIGS. 5 (a) and 5 (b).
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[0034]
FIG. 5A is a view showing the structure of the speaker device when the back door 3 is opened.
When the back door 3 is opened, the enclosure 10, the speaker unit 11, and the port 13 become
a bass reflex type speaker device. Here, the bass reflex type speaker is a speaker device provided
in the enclosure with a coupling port that couples the internal space of the enclosure and the
external space, and a speaker unit. The port 13 is a coupling port that couples the internal space
of the enclosure 10 and the external space. Also, the speaker unit 11 is provided in the enclosure
10. Similarly, the enclosure 20, the speaker unit 21 and the port 23 become a bass reflex type
speaker device.
[0035]
The sound output from the front of the speaker unit 11 is output to the external space of the
enclosure 10. Further, the sound output from the back of the speaker unit 11 is output to the
external space of the enclosure 10 via the port 13. The operation of the speaker unit 21 is also
the same as the operation of the speaker unit 11.
[0036]
FIG. 5B is a diagram showing an internal configuration of the speaker device when the back door
3 is closed. When the back door 3 is closed, the enclosures 10 and 20, the speaker units 11 and
21, and the ports 13 and 23 form a Kelton-type speaker device.
[0037]
Here, the Kelton-type speaker device includes a non-sealed chamber in which the inner space and
the outer space of the enclosure are connected by the coupling port, and a closed chamber which
does not connect the inner space and the outer space of the enclosure. It is the speaker
apparatus in which the speaker unit was provided in the boundary. The frequency characteristic
of the bass of the Kelton-type speaker device attenuates more slowly than the bass reflex-type
speaker device having the same volume. Therefore, the Kelton-type speaker device is a speaker
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device suitable for low-frequency reproduction as compared with a bass reflex-type speaker
device having the same volume.
[0038]
The chamber 14 is an internal space of the enclosure 10, and the chamber 24 is an internal
space of the enclosure 20. Since the port 13 is closed by the closing member 29 when the back
door 3 is closed, the chamber 14 becomes a closed chamber. Also, the port 23 is a coupling port
that couples the internal space of the enclosure 20 and the external space. Chamber 24 is a nonhermetic chamber coupled to the exterior space of enclosure 20 by port 23.
[0039]
When the back door 3 is closed, the sound output from the speaker units 11 and 21 into the
chamber 14 is confined in the chamber 14. Thus, the sound output to the chamber 14 does not
interfere with the sound output to the chamber 24. On the other hand, the sound output from the
speaker units 11 and 21 into the chamber 24 is output from the port 23 to the external space.
[0040]
With this configuration, the lowest resonance frequency is lowered because the elasticity of the
air of the chamber 14, which is a sealed chamber, the elasticity of the speaker units 11 and 21,
and the equivalent mass of the air in the port 23 resonate in series.
[0041]
Further, the volume of the speaker device when the back door 3 is closed is the sum of the
volumes of the enclosure 10 and the enclosure 20.
As the volume of the speaker device increases, the lowest resonance frequency decreases.
Therefore, the lowest resonance frequency when the back door 3 is closed is lower than when
the back door 3 is opened. The lowest resonance frequency is a frequency that represents the
reproduction limit of the bass. That is, lowering the lowest resonance frequency is equivalent to
lowering the reproduction limit of the bass.
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[0042]
As described above, when the back door 3 is closed, the vehicle-mounted acoustic device
according to the present embodiment can lower the reproduction limit of the bass as compared
to when the back door 3 is opened, and bass reproduction becomes possible.
[0043]
Next, the configuration of the output device 7a will be described using FIG.
The output device 7a includes a central processing unit (CPU) 50, a reproduction device 51, a
read only memory (ROM) 52, a random access memory (RAM) 53, an open / close sensor 54, a
restart switch 55, and a mixer 56. , Equalizers 57a and 57b, a polarity conversion switch 58a,
amplifiers 59a and 59b, and an operation switch 60.
[0044]
The CPU 50 reads the program stored in the ROM 52 into the RAM 53, and controls each unit by
executing the program read into the RAM 53. The playback device 51 decodes data recorded on
a storage medium such as a CD (Compact Disc), an MD (Mini Disc), a DVD (Digital Versatile Disc),
a cassette tape, a hard disk, a flash memory, and reproduces it as an acoustic signal. . The
reproduction device 51 outputs the left channel acoustic signal to the signal line 61a, and
outputs the right channel acoustic signal to the signal line 61b.
[0045]
Further, the open / close sensor 54 detects whether the back door 3 is open or closed, and
notifies the CPU 50. A signal that the open / close sensor 54 notifies the CPU 50 is called a
detection signal. The restart switch 55 is operated by the user of the vehicle-mounted audio
device, and is a switch for resuming reproduction when reproduction is stopped. The operation
switch 60 is operated by the user of the in-vehicle acoustic device. The operation switch 60
detects an operation such as start of reproduction, stop of reproduction, removal of a CD or the
like, and notifies the CPU 50 of the operation.
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[0046]
Further, as shown in FIG. 7, the mixer 56 includes gain adjustment amplifiers 72 a to 72 d and
adders 73 a and 73 b. The left channel acoustic signal input from the signal line 61a is input to
the gain adjustment amplifiers 72a and 72b, and the right channel acoustic signal input from the
signal line 61b is input to the gain adjustment amplifiers 72c and 72d. The acoustic signals input
to the gain adjustment amplifiers 72a to 72d are multiplied by a predetermined gain arbitrarily
set by the CPU 50 and output. The outputs of the gain adjustment amplifiers 72a to 72d are
called gain acoustic signals.
[0047]
The gain acoustic signals output from the gain adjustment amplifiers 72a and 72c are added by
the adder 73a. The gain acoustic signals output from the gain adjustment amplifiers 72b and 72d
are added by the adder 73b. The outputs of the adders 73a and 73b are referred to as addition
sound signals.
[0048]
The mixer 56 can mix and output the left or right channel acoustic signal at a desired ratio
depending on the setting of the gain. For example, the gains of the gain adjustment amplifiers
72a and 72d are set to 1 and the gains of the gain adjustment amplifiers 72b and 72c are set to
0. The gain acoustic signal obtained by multiplying the left channel acoustic signal by a gain of 1
and the gain acoustic signal obtained by multiplying the right channel acoustic signal by a gain of
0 are input to the adder 73a. As a result, the adder 73a outputs the left channel acoustic signal as
it is as a summed acoustic signal. In the adder 73b, a gain acoustic signal obtained by multiplying
the left channel acoustic signal input to the signal line 61a by a gain of 0, and a right channel
acoustic signal input to the signal line 61b are multiplied by the gain of 1 And the gain acoustic
signal is input. As a result, the adder 73b outputs the right channel acoustic signal as it is as a
summed acoustic signal.
[0049]
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Further, it is assumed that the gain of each of the gain adjustment amplifiers 72a to 72d is set to,
for example, 0.5. The adder 73a has a gain acoustic signal obtained by multiplying the left
channel acoustic signal input to the signal line 61a by a gain of 0.5 and a right acoustic signal
input to the signal line 61b by 0.5. The gain acoustic signal multiplied by the gain is input. As a
result, the adder 73a adds the left and right channel acoustic signals at the same ratio, and
outputs the result as a summed acoustic signal. Similar to the adder 73a, the adder 73b adds the
left and right channel acoustic signals at the same ratio, and outputs the result as an additive
acoustic signal.
[0050]
The mixer 56 may have a circuit that receives not only two systems of left or right channel
acoustic signals but also three or more systems of acoustic signals, mixes them with a desired
gain, and outputs the mixed signals. For example, when N series (N is an integer of 3 or more)
acoustic signals are input to the mixer 56, each of the input acoustic signals is input to two
different gain adjustment amplifiers. The outputs of the two different gain adjustment amplifiers
are input to adders 73a and 73b, respectively. With this configuration, the mixer 56 can output
an acoustic signal obtained by mixing three or more acoustic signals.
[0051]
In addition, the equalizers 57a and 57b calculate the addition sound signal output from the mixer
56 by using a filter having a desired frequency characteristic. The frequency characteristics of
the equalizers 57a and 57b can be arbitrarily set by the CPU 50. For example, the equalizers 57a
and 57b can emphasize vocals by increasing the filter gain in the frequency band of speech. Also,
the equalizers 57a and 57b can emphasize the bass by increasing the gain of the filter in the low
frequency band. The acoustic signals output from the equalizers 57a and 57b are referred to as
equalizer acoustic signals.
[0052]
The polarity conversion switch 58a outputs the inverted equalizer sound signal without inverting
the polarity of the input equalizer sound signal or inverts the polarity of the input equalizer
sound signal and outputs the inverted signal. The polarity conversion switch 58 a is controlled by
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the CPU 50.
[0053]
Further, the amplifier 59 a amplifies the acoustic signal output from the polarity conversion
switch 58 a and outputs the acoustic signal to the speaker unit 11. The amplifier 59 b amplifies
the equalizer acoustic signal output from the equalizer 57 b and outputs the amplified acoustic
signal to the speaker unit 12.
[0054]
The gain adjustment amplifiers 72a to 72d can be set to have not only positive gains but also
negative gains. When the negative gain is set, the polarity of the acoustic signal input to the gain
adjustment amplifiers 72a to 72d and the polarity of the acoustic signal output from the gain
adjustment amplifiers 72a to 72d are inverted. By setting the negative gain, the vehicle-mounted
acoustic device in the present embodiment can be configured without the polarity conversion
switch 58a.
[0055]
Next, the operation of the in-vehicle acoustic device according to the present embodiment will be
described with reference to FIG.
[0056]
After the on-vehicle acoustic device is powered on (S1), the CPU 50 determines whether the
operation switch 60 has been operated to start reproduction (S2).
When the CPU 50 determines NO in step S2, the CPU 50 executes step S2 again. If the CPU 50
determines YES in step S2, it determines whether the back door 3 is opened based on the
detection signal from the open / close sensor 54 (S3).
[0057]
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If the CPU 50 determines YES in step S3, the CPU 50 executes steps S4, S5, S6, and S10 in order.
The CPU 50 performs the following setting on the mixer 56 (S4). The CPU 50 sets the gains of
the gain adjustment amplifiers 72a and 72d of the mixer 56 to 1 and sets the gains of the gain
adjustment amplifiers 72b and 72c of the mixer 56 to 0. After finishing the step S4, the CPU 50
sets the equalizers 57a and 57b (S5). The CPU 50 controls the equalizers 57a and 57b to operate
as filters having desired frequency characteristics. When the operation switch 60 is operated by
the user so as to have a specific frequency characteristic, the CPU 50 sets the equalizers 57a and
57b so as to have the specific frequency characteristic. After completing step S5, the CPU 50
controls the polarity conversion switch 58 so that the polarity is not reversed (S6).
[0058]
After completing the step S6, the CPU 50 causes the reproduction device 51 to start
reproduction. The reproduction device 51 outputs the left channel acoustic signal to the signal
line 61a, and outputs the right channel acoustic signal to the signal line 61b (S10). The mixer 56
outputs the left channel acoustic signal to the equalizer 57 a and the right channel acoustic
signal to the equalizer 57 b as it is. The equalizer acoustic signal output from the equalizer 57a is
not inverted in polarity by the polarity conversion switch 58a, and is input as it is to the speaker
unit 11 via the amplifier 59a, and the speaker unit 11 outputs the sound of the left channel. The
equalizer acoustic signal output from the equalizer 57 b is input to the speaker unit 21 via the
amplifier 59 b as it is, and the speaker unit 21 outputs the sound of the right channel.
[0059]
As described above, when the back door 3 is opened, the speaker units 11 and 21 become stereo
speakers. The user of the in-vehicle audio apparatus can listen to music and the like outside the
vehicle through the stereo speakers.
[0060]
When the CPU 50 determines NO in step S3, the CPU 50 executes steps S7, S8, S9, and S10 in
order. The CPU 50 performs the following setting on the gain adjustment amplifiers 72a to 72d
of the mixer 56 (S7). The CPU 50 sets the gains of the gain adjustment amplifiers 72a to 72d to
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0.5. After completing the step S7, the CPU 50 performs the following setting on the equalizers
57a and 57b (S8). The CPU 50 controls the equalizers 57a and 57b to operate as a low pass filter
(S8). After completing step S8, the CPU 50 controls the polarity conversion switch 58 so that the
polarity is reversed (S9). Since the CPU 50 performs steps S8 and S9, there is no need for the
user of the in-vehicle acoustic device to perform setting operations of the equalizers 57a and 57b
and the polarity conversion switch 58.
[0061]
After completing step S9, the CPU 50 causes the reproduction device 51 to start reproduction.
The reproduction device 51 outputs the left channel acoustic signal to the signal line 61a, and
outputs the right channel acoustic signal to the signal line 61b (S10). The mixer 56 outputs an
acoustic signal including left and right channel acoustic signals in the same ratio to the
equalizers 57a and 57b. The equalizers 57a and 57b output equalizer acoustic signals including
frequency components lower than the predetermined frequency more than frequency
components higher than the predetermined frequency. The equalizer acoustic signal output from
the equalizer 57a is inverted in polarity by the polarity conversion switch 58a, and is input to the
speaker unit 11 via the amplifier 59a. Also, the equalizer sound signal output from the equalizer
57 b is input to the speaker unit 21 via the amplifier 59 b as it is.
[0062]
When the back door 3 is closed, in order to operate the speaker units 11 and 21 as one speaker
unit, it is necessary to make the vibration directions of the speaker units 11 and 21 the same.
This is because the speaker units 11 and 21 face each other. That is, the acoustic signals
respectively input to the speaker units 11 and 21 need to be acoustic signals in which one
polarity is inverted and the other polarity is not inverted for the same addition acoustic signal. In
step S7, the mixer 56 outputs the same addition acoustic signal including the left and right
channel acoustic signals in the same ratio to the equalizers 57a and 57b. Further, in step S9, the
polarity of the equalizer acoustic signal of the equalizer 57a is inverted. By steps S7 and S9,
when the back door 3 is closed, the acoustic signal input to the speaker unit 11 becomes an
acoustic signal obtained by inverting the polarity of the acoustic signal input to the speaker unit
21, and the vibration directions of the speaker units 11 and 21 are It can be the same. Thus,
when the back door 3 is closed, the speaker units 11 and 21 become one speaker unit.
[0063]
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Further, at step S8, an acoustic signal including more frequency components lower than the
predetermined frequency than frequency components higher than the predetermined frequency
is input to the speaker units 11 and 21. As described in FIG. 5, the vehicle-mounted acoustic
device according to the present embodiment can reproduce bass when the back door is closed. A
user of the in-vehicle acoustic device can listen to music and the like in the vehicle compartment
with a speaker device for bass reproduction.
[0064]
As described above, when the speaker system provided at the rear of the vehicle 1a is used in the
vehicle when the back door is closed, the vehicle-mounted acoustic device according to the
present embodiment can enhance the bass reproduction capability of the speaker system. Even
when the luggage is placed in the room or the tono cover is attached, the sound output from the
speaker device can be easily transmitted to the user, so that the speaker device can be effectively
used.
[0065]
Although the reproduction device 51 is described as outputting the left channel acoustic signal to
the signal line 61a and outputting the right channel acoustic signal to the signal line 61b, the
same acoustic signal is output to the signal line 61a and the signal line 61b. It is also good.
[0066]
Although the polarity conversion switch 58a is provided on the output side of the equalizer 57a,
it may alternatively be provided on the output side of the equalizer 57b.
This is because it is only necessary to invert the polarity of one of the acoustic signals input to
the speaker unit 11 or 21.
[0067]
Note that the order of steps S4, S5, and S6 is not limited to the order shown in FIG.
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This is because steps S4, S5, and S6 may be completed by the time the reproducing device 51
starts the reproduction (S10). Further, the order of steps S7, S8 and S9 is not limited to the order
shown in FIG.
[0068]
After step S10, the CPU 50 determines whether to stop reproduction (S11). When the CPU 50
determines YES in step S11, the CPU 50 stops the reproduction of the reproduction device 51
(S12). When the operation switch 60 is operated to stop reproduction, or when a removable
recording medium such as a CD, MD, or DVD is taken out from the reproduction device 51, the
CPU 50 determines that reproduction is to be stopped. .
[0069]
If the CPU 50 determines NO in step S11, the CPU 50 receives a detection signal from the open /
close sensor 54, and determines whether the back door 3 has been closed and has changed to
the open state (S13). When the CPU 50 determines YES in step S13, the CPU 50 stops the
reproduction of the reproduction device 51 (S14). As a result, when the back door 3 is opened
while the loud sound is being output in the vehicle compartment, it is possible to prevent the
loud sound from being output outside the vehicle. If the CPU 50 determines NO in step S13, the
process returns to step S11.
[0070]
After completing step S14, the CPU 50 determines whether the restart switch 55 has been
pressed (S15). If the CPU 50 determines YES in step S15, the process returns to step S03. If the
CPU 50 determines NO in step S15, the process returns to step S15 again. The CPU 50 can also
end the process if the restart switch is not pressed within the predetermined time in step S15.
The restart switch 55 is preferably installed at the rear of the vehicle 1a. As a result, the user can
resume reproduction while being close to the back door 3, which enhances convenience.
[0071]
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In addition, the CPU 50 can omit steps S13, S14 and S15. In this case, when the CPU 50
determines NO in step S11, it executes step S11 again.
[0072]
In addition, the CPU 50 in step S3 assumes that the back door 3 is not completely closed and the
lock function for fixing the back door 3 does not work as a half door, and can repeat step S3 until
it is not a half door. . In the case of a half door, the speaker units 11 and 21 do not approach and
do not operate as one speaker unit. Therefore, the CPU 50 can also stop reproduction when the
door is half.
[0073]
Further, when the restart switch 55 is not pressed within the predetermined time in step S15, the
CPU 50 can also end the process.
[0074]
Also, after the CPU 50 ends the process, the process can be returned to step S02.
[0075]
Second Embodiment An in-vehicle acoustic apparatus according to a second embodiment of the
present invention is shown in FIG.
[0076]
The differences between the second embodiment and the first embodiment will be described
below.
The vehicle 1b in the second embodiment is different from the vehicle 1a in the first embodiment
in that the backdoor 3 is opened in the horizontal direction in that the backdoor 3 is opened in
the vertical direction.
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In the vehicle 1b, when two speaker units are installed on the back door 3 and the vehicle body
2, respectively, when the back door 3 is opened, the two speaker units are in the vertical
direction with respect to the ground, and the sound of the right channel and the left channel is
from the vertical direction. It will be output.
[0077]
Therefore, the on-vehicle acoustic device in the present embodiment is provided with four
speaker units as shown in FIG.
The enclosure 30a, the speaker unit 31a, the sealing material 32a and the port 33a are arranged
in the same manner as the enclosure 10, the speaker unit 11, the sealing material 12 and the
port 13. In addition, an enclosure 40 a is provided at an end of the inner surface of the back door
3 opposite to the hinge 5. The speaker unit 41 a, the sealing material 42 a and the port 43 a are
arranged in the same manner as the speaker unit 21, the sealing material 22 and the port 23.
When the back door 3 is opened, the speaker units 31a, 41a and the ports 33a, 43a face in the
negative direction of the X axis.
[0078]
In addition, the closing member 49 a for closing the port 33 a is disposed, for example, in the
positive direction of the Y axis than the enclosure 40 a on the inner surface of the back door 3. In
addition, the speaker unit 31a is disposed substantially symmetrically with the speaker unit 41a
with respect to a plane (not shown) that divides the angle of rotation of the back door 3 into two
equal parts. In addition, the port 33a is disposed substantially symmetrically with the blocking
member 49a with respect to a plane that divides the angle of rotation of the back door 3 into two
equal parts.
[0079]
The enclosure 30b, the speaker unit 31b, the sealing member 32b, and the port 33b are the
enclosure 30a, the speaker unit 31a, the sealing member 32a, and the port 33a with respect to
the cross section 84 parallel to the XZ plane and passing through the vehicle 1a. It is preferable
that it becomes substantially symmetrical. In addition, the enclosure 40b, the speaker unit 41b,
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the sealing material 42b, the port 43b and the closing material 49b are substantially symmetrical
with the enclosure 40a, the speaker unit 41a, the sealing material 42a, the port 43a and the
closing material 49a with respect to the cross section 84. Is preferred. Moreover, the vehiclemounted acoustic device in this embodiment is provided with the output device 7b which is not
shown in figure.
[0080]
FIG. 10 is a view of the in-vehicle acoustic device according to the present embodiment as viewed
from the rear of the vehicle 1b when the back door 3 is closed. When the back door 3 is closed,
the speaker units 31a and 41a face each other and approach each other to form one speaker
unit. The ports 33 a are closed by the closing members 49 a provided on the back door 3.
Further, when the back door 3 is closed, the port 43a faces in the direction of the passenger
compartment, which is the positive direction of the X axis.
[0081]
Next, as shown in FIG. 11, the output device 7b of the vehicle-mounted acoustic device according
to the present embodiment has twice as many equalizers, polarity conversion switches and
amplifiers as the output device 7a described in FIG. There is. The operation of the equalizers 57c
and 57e is the same as that of the equalizer 57a, and the operation of the equalizers 57d and 57f
is the same as that of the equalizer 57b. The operation of the polarity conversion switches 58b
and 58c is the same as that of the polarity conversion switch 58a.
[0082]
As described above, when the back door 3 is opened, the speaker units 31a and 41a output the
sound of the left channel, and the speaker units 31b and 41b output the sound of the right
channel.
[0083]
As described above, the in-vehicle acoustic device according to the present invention can be
applied to a vehicle in which the back door 3 opens in the vertical direction.
[0084]
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As described above, when the speaker system provided at the rear of the vehicle is used in the
vehicle when the back door is closed, the vehicle-mounted audio system according to the present
invention can enhance the bass reproduction capability of the speaker system and load the
luggage in the luggage compartment Even when the speaker is mounted or the tono cover is
attached, the sound output from the speaker device can be easily transmitted to the user, so that
the speaker device can be effectively used.
The in-vehicle acoustic device according to the present invention is useful, for example, as an invehicle acoustic device or the like that uses a speaker device that reproduces an acoustic signal
for outside the vehicle as a speaker device for reproducing bass when the door is closed.
[0085]
A view of the vehicle when the back door is opened according to the first embodiment of the
present invention as viewed from behind the vehicle A view of the vehicle when the back door is
opened according to the first embodiment of the present invention is viewed from above the
vehicle FIG. 6 is a view of the vehicle when the back door is opened according to the first
embodiment as viewed from above the vehicle, and FIG. 5 is a perspective view of the vehicle
rear when the back door is closed according to the first embodiment of the present invention.
FIG. 1 is a schematic view showing an internal configuration of a speaker device according to a
first embodiment of the present invention. FIG. 2 is a block diagram of an on-vehicle acoustic
device according to a first embodiment of the present invention. The flowchart for demonstrating
the operation | movement of the vehicle-mounted acoustic apparatus in embodiment of this
invention The figure which looked at the vehicle at the time of the backdoor opening in 2nd
Embodiment of this invention from the vehicle back 2nd Embodiment of this invention After the
vehicle when the back door is closed Block diagram of the in-vehicle audio apparatus according
to the second embodiment of the perspective view the present invention
Explanation of sign
[0086]
DESCRIPTION OF SYMBOLS 1a, 1b Vehicle 2 Body 3 Backdoor 5 Hinge 6 Bottom of
compartment 7a, 7b Output device 8 Rear seat 10, 20 Enclosure 11, 21 Speaker unit 12, 22
Sealing material 13, 23 Port 14, 24 Chamber 15, 25 Enclosure Outer surface 29 blocker 30a,
30b, 40a, 40b enclosure 31a, 31b, 41a, 41b speaker unit 32a, 32b, 42a, 42b sealer 33a, 33b,
43a, 43b port 35a, 35b, 45a, 45b enclosure outer surface 49a, 49b blocker 50 CPU 51 playback
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device 52 ROM 53 RAM 54 open / close sensor 55 restart switch 56 mixer 57a to 57f equalizer
58a to 58c polarity conversion switch 59a to 59f amplifier 60 operation switch 6 a, 61b, 62a,
62b signal line 63 control line 72a~72d gain adjusting amplifier 73a, 73b adder
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